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Small‐ S cale Deformation of Pulsed Electric Current Sintered Silicon Oxycarbide Polymer Derived Ceramics
Author(s) -
Sujith Ravindran,
Srinivasan Nedunchezhian,
Kumar Ravi
Publication year - 2013
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201300146
Subject(s) - materials science , nanoindentation , composite material , indentation , ceramic , elastic modulus , deformation (meteorology) , sintering , amorphous solid , crystallography , chemistry
The deformation behavior of pulsed electric current sintered silicon oxycarbide ceramics produced by the solid‐state thermolysis of polyhydridomethylsiloxane at small‐scale is investigated. The ceramics remained X‐ray amorphous after sintering at 1300 °C in vacuum and a high density of ≈2.35 g cm −3 is achieved. The elastic constants of these ceramics are determined using non‐destructive ultrasonic testing method. The elasto‐plastic deformation under contact loading is determined using depth sensing nanoindentation technique. An indentation hardness of ≈11 GPa and reduced elastic modulus of ≈105 GPa is observed. The load–displacement curves display significant elastic recovery with an elastic work ratio of ≈0.71. The evolution of Hertzian cone cracks upon microindentation indicates an anomalous deformation behavior.